Re: [rcu_sched stall] regression/miss-config ?

From: santosh.shilimkar@xxxxxxxxxx
Date: Mon May 16 2016 - 00:36:21 EST

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On 5/15/16 2:18 PM, Santosh Shilimkar wrote:

Hi Paul,

I was asking Sasha about [1] since other folks in Oracle
also stumbled upon similar RCU stalls with v4.1 kernel in
different workloads. I was reported similar issue with
RDS as well and looking at [1], [2], [3] and [4], thought
of reaching out to see if you can help us to understand
this issue better.

Have also included RCU specific config used in these
test(s). Its very hard to reproduce the issue but one of
the data point is, it reproduces on systems with larger
CPUs(64+). Same workload with less than 64 CPUs, don't
show the issue. Someone also told me, making use of
SLAB instead SLUB allocator makes difference but I
haven't verified that part for RDS.

Let me know your thoughts. Thanks in advance !!

One of my colleague told me the pastebin server I used
is Oracle internal only so adding the relevant logs along
with email.

Regards,
Santosh

[1] https://lkml.org/lkml/2014/12/14/304

[2] Log 1 snippet:
-----------------------------------------------------------------
INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched self-detected stall on CPU { 54} (t=60000 jiffies g=66023 c=66022 q=0)
Task dump for CPU 54:
ksoftirqd/54 R running task 0 389 2 0x00000008
0000000000000007 ffff88ff7f403d38 ffffffff810a8621 0000000000000036
ffffffff81ab6540 ffff88ff7f403d58 ffffffff810a86cf 0000000000000086
ffffffff81ab6940 ffff88ff7f403d88 ffffffff810e3ad3 ffffffff81ab6540
Call Trace:
<IRQ> [<ffffffff810a8621>] sched_show_task+0xb1/0x120
[<ffffffff810a86cf>] dump_cpu_task+0x3f/0x50
[<ffffffff810e3ad3>] rcu_dump_cpu_stacks+0x83/0xc0
[<ffffffff810e490c>] print_cpu_stall+0xfc/0x170
[<ffffffff810e5eeb>] __rcu_pending+0x2bb/0x2c0
[<ffffffff810e5f8d>] rcu_check_callbacks+0x9d/0x170
[<ffffffff810e9772>] update_process_times+0x42/0x70
[<ffffffff810fb589>] tick_sched_handle+0x39/0x80
[<ffffffff810fb824>] tick_sched_timer+0x44/0x80
[<ffffffff810ebc04>] __run_hrtimer+0x74/0x1d0
[<ffffffff810fb7e0>] ? tick_nohz_handler+0xa0/0xa0
[<ffffffff810ebf92>] hrtimer_interrupt+0x102/0x240
[<ffffffff810521f9>] local_apic_timer_interrupt+0x39/0x60
[<ffffffff816c47b5>] smp_apic_timer_interrupt+0x45/0x59
[<ffffffff816c263e>] apic_timer_interrupt+0x6e/0x80
<EOI> [<ffffffff8118db64>] ? free_one_page+0x164/0x380
[<ffffffff8118de43>] ? __free_pages_ok+0xc3/0xe0
[<ffffffff8118e775>] __free_pages+0x25/0x40
[<ffffffffa21054f0>] rds_message_purge+0x60/0x150 [rds]
[<ffffffffa2105624>] rds_message_put+0x44/0x80 [rds]
[<ffffffffa21535b4>] rds_ib_send_cqe_handler+0x134/0x2d0 [rds_rdma]
[<ffffffff816c102b>] ? _raw_spin_unlock_irqrestore+0x1b/0x50
[<ffffffffa18c0273>] ? mlx4_ib_poll_cq+0xb3/0x2a0 [mlx4_ib]
[<ffffffffa214c6f1>] poll_cq+0xa1/0xe0 [rds_rdma]
[<ffffffffa214d489>] rds_ib_tasklet_fn_send+0x79/0xf0 [rds_rdma]
[<ffffffff81084b31>] tasklet_action+0xb1/0xc0
[<ffffffff810854a2>] __do_softirq+0xf2/0x2f0
[<ffffffff810a4930>] ? smpboot_create_threads+0x80/0x80
[<ffffffff810856cd>] run_ksoftirqd+0x2d/0x50
[<ffffffff810a4a46>] smpboot_thread_fn+0x116/0x170
[<ffffffff810a11ae>] kthread+0xce/0xf0
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff816c1b62>] ret_from_fork+0x42/0x70
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
Task dump for CPU 66:
ksoftirqd/66 R running task 0 474 2 0x00000008
04208040664afe58 ffff88ff664ac008 000000010005d97a 0000000a39b2e200
0000000000000018 0000000000000006 ffff88ff664a1c00 ffff88ff669a5260
ffff88ff664a1c00 ffffffff81aa4ec0 ffffffff810a4930 0000000000000000
Call Trace:
[<ffffffff810a4930>] ? smpboot_create_threads+0x80/0x80
[<ffffffff810856cd>] ? run_ksoftirqd+0x2d/0x50
[<ffffffff810a4a46>] ? smpboot_thread_fn+0x116/0x170
[<ffffffff810a11ae>] ? kthread+0xce/0xf0
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff816c1b62>] ? ret_from_fork+0x42/0x70
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
{ 66} (t=60011 jiffies g=66023 c=66022 q=0)
Task dump for CPU 54:
ksoftirqd/54 R running task 0 389 2 0x00000008
04208040669e3e58 ffff88ff669e0008 000000010005d981 0000000a39b28e00
0000000000000000 0000000000000006 ffff88ff669d1c00 ffff88ff669a5020
ffff88ff669d1c00 ffffffff81aa4ec0 ffffffff810a4930 0000000000000000
Call Trace:
[<ffffffff810a4930>] ? smpboot_create_threads+0x80/0x80
[<ffffffff810856cd>] ? run_ksoftirqd+0x2d/0x50
[<ffffffff810a4a46>] ? smpboot_thread_fn+0x116/0x170
[<ffffffff810a11ae>] ? kthread+0xce/0xf0
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff816c1b62>] ? ret_from_fork+0x42/0x70
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
Task dump for CPU 66:
ksoftirqd/66 R running task 0 474 2 0x00000008
0000000000000003 ffff88ff7f703d38 ffffffff810a8621 0000000000000042
ffffffff81ab6540 ffff88ff7f703d58 ffffffff810a86cf 0000000000000086
ffffffff81ab6a40 ffff88ff7f703d88 ffffffff810e3ad3 ffffffff81ab6540
Call Trace:
<IRQ> [<ffffffff810a8621>] sched_show_task+0xb1/0x120
[<ffffffff810a86cf>] dump_cpu_task+0x3f/0x50
[<ffffffff810e3ad3>] rcu_dump_cpu_stacks+0x83/0xc0
[<ffffffff810e490c>] print_cpu_stall+0xfc/0x170
[<ffffffff810e5eeb>] __rcu_pending+0x2bb/0x2c0
[<ffffffff810e5f8d>] rcu_check_callbacks+0x9d/0x170
[<ffffffff810e9772>] update_process_times+0x42/0x70
[<ffffffff810fb589>] tick_sched_handle+0x39/0x80
[<ffffffff810fb824>] tick_sched_timer+0x44/0x80
[<ffffffff810ebc04>] __run_hrtimer+0x74/0x1d0
[<ffffffff810fb7e0>] ? tick_nohz_handler+0xa0/0xa0
[<ffffffff810ebf92>] hrtimer_interrupt+0x102/0x240
[<ffffffff810521f9>] local_apic_timer_interrupt+0x39/0x60
[<ffffffff816c47b5>] smp_apic_timer_interrupt+0x45/0x59
[<ffffffff816c263e>] apic_timer_interrupt+0x6e/0x80
<EOI> [<ffffffff8118db64>] ? free_one_page+0x164/0x380
[<ffffffff8118de43>] ? __free_pages_ok+0xc3/0xe0
[<ffffffff8118e775>] __free_pages+0x25/0x40
[<ffffffffa21054f0>] rds_message_purge+0x60/0x150 [rds]
[<ffffffffa2105624>] rds_message_put+0x44/0x80 [rds]
[<ffffffffa21535b4>] rds_ib_send_cqe_handler+0x134/0x2d0 [rds_rdma]
[<ffffffff816c102b>] ? _raw_spin_unlock_irqrestore+0x1b/0x50
[<ffffffffa18c0273>] ? mlx4_ib_poll_cq+0xb3/0x2a0 [mlx4_ib]
[<ffffffffa214c6f1>] poll_cq+0xa1/0xe0 [rds_rdma]
[<ffffffffa214d489>] rds_ib_tasklet_fn_send+0x79/0xf0 [rds_rdma]
[<ffffffff81084b31>] tasklet_action+0xb1/0xc0
[<ffffffff810854a2>] __do_softirq+0xf2/0x2f0
[<ffffffff810a4930>] ? smpboot_create_threads+0x80/0x80
[<ffffffff810856cd>] run_ksoftirqd+0x2d/0x50
[<ffffffff810a4a46>] smpboot_thread_fn+0x116/0x170
[<ffffffff810a11ae>] kthread+0xce/0xf0
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff816c1b62>] ret_from_fork+0x42/0x70
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
-----------------------------------------------------------------

[3] log 2 snippet
-------------------------------------------------------------------
INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks: { 77} (detected by 207, t=60002 jiffies, g=40822, c=40821, q=0)
Task dump for CPU 77:
rds-stress R running task 0 2930 2867 0x0000008a
0000000000000018 0000000000000286 ffff893e00000000 ffffffff810ec828
ffff883f5628d160 0000000000000282 ffff89407ffda440 00000000f4d139b8
0000000100000000 ffff89407ffdae08 0000000000000000 000000004dcc9f40
Call Trace:
[<ffffffff810ec828>] ? hrtimer_try_to_cancel+0x48/0xe0
[<ffffffff8118d7b3>] ? __alloc_pages_nodemask+0x193/0x2b0
[<ffffffff810c52ac>] ? remove_wait_queue+0x3c/0x50
[<ffffffff811d747f>] ? alloc_pages_current+0xaf/0x170
[<ffffffffa2135298>] ? rds_page_remainder_alloc+0x48/0x2a0 [rds]
[<ffffffffa212f06d>] ? rds_message_copy_from_user+0x6d/0x130 [rds]
[<ffffffffa2133040>] ? rds_sendmsg+0x470/0x990 [rds]
[<ffffffff811ffa00>] ? rw_copy_check_uvector+0xa0/0x130
[<ffffffff815c9ffd>] ? sock_sendmsg+0x4d/0x60
[<ffffffff815cc93a>] ? ___sys_sendmsg+0x30a/0x330
[<ffffffff811b77fc>] ? handle_pte_fault+0x20c/0x230
[<ffffffff815ccb69>] ? __sys_sendmsg+0x49/0x90
[<ffffffff81023611>] ? syscall_trace_leave+0xf1/0x140
[<ffffffff815ccbc9>] ? SyS_sendmsg+0x19/0x20
[<ffffffff816c176e>] ? system_call_fastpath+0x12/0x71
{ 77} (t=60011 jiffies g=40822 c=40821 q=0)
Task dump for CPU 77:
rds-stress R running task 0 2930 2867 0x0000008a
000000000000000e ffff893f7f5439c0 ffffffff810a8621 000000000000004d
ffffffff81ab6540 ffff893f7f5439e0 ffffffff810a86cf 0000000000000082
ffffffff81ab6a40 ffff893f7f543a10 ffffffff810e3ad3 ffffffff81ab6540
Call Trace:
<IRQ> [<ffffffff810a8621>] sched_show_task+0xb1/0x120
[<ffffffff810a86cf>] dump_cpu_task+0x3f/0x50
[<ffffffff810e3ad3>] rcu_dump_cpu_stacks+0x83/0xc0
[<ffffffff810e490c>] print_cpu_stall+0xfc/0x170
[<ffffffff810e5eeb>] __rcu_pending+0x2bb/0x2c0
[<ffffffff810e5f8d>] rcu_check_callbacks+0x9d/0x170
[<ffffffff810e9772>] update_process_times+0x42/0x70
[<ffffffff810fb589>] tick_sched_handle+0x39/0x80
[<ffffffff810fb824>] tick_sched_timer+0x44/0x80
[<ffffffff810ebc04>] __run_hrtimer+0x74/0x1d0
[<ffffffff810fb7e0>] ? tick_nohz_handler+0xa0/0xa0
[<ffffffff811df679>] ? __free_slab+0xd9/0x1b0
[<ffffffff810ebf92>] hrtimer_interrupt+0x102/0x240
[<ffffffff810521f9>] local_apic_timer_interrupt+0x39/0x60
[<ffffffff816c47b5>] smp_apic_timer_interrupt+0x45/0x59
[<ffffffff816c263e>] apic_timer_interrupt+0x6e/0x80
[<ffffffff8118db64>] ? free_one_page+0x164/0x380
[<ffffffff8118de43>] ? __free_pages_ok+0xc3/0xe0
[<ffffffff8118e775>] __free_pages+0x25/0x40
[<ffffffffa212f4f0>] rds_message_purge+0x60/0x150 [rds]
[<ffffffffa212f624>] rds_message_put+0x44/0x80 [rds]
[<ffffffffa217d5b4>] rds_ib_send_cqe_handler+0x134/0x2d0 [rds_rdma]
[<ffffffff816c102b>] ? _raw_spin_unlock_irqrestore+0x1b/0x50
[<ffffffffa18fe273>] ? mlx4_ib_poll_cq+0xb3/0x2a0 [mlx4_ib]
[<ffffffffa21766f1>] poll_cq+0xa1/0xe0 [rds_rdma]
[<ffffffffa2177489>] rds_ib_tasklet_fn_send+0x79/0xf0 [rds_rdma]
[<ffffffff81084b31>] tasklet_action+0xb1/0xc0
[<ffffffff810854a2>] __do_softirq+0xf2/0x2f0
[<ffffffff810594f4>] ? native_apic_msr_eoi_write+0x14/0x20
[<ffffffff81085815>] irq_exit+0x125/0x130
[<ffffffff816c45f5>] do_IRQ+0x65/0x110
[<ffffffff816c22ae>] common_interrupt+0x6e/0x6e
<EOI> [<ffffffff8118bf28>] ? get_page_from_freelist+0x2b8/0x750
[<ffffffff810ec828>] ? hrtimer_try_to_cancel+0x48/0xe0
[<ffffffff8118d7b3>] __alloc_pages_nodemask+0x193/0x2b0
[<ffffffff810c52ac>] ? remove_wait_queue+0x3c/0x50
[<ffffffff811d747f>] alloc_pages_current+0xaf/0x170
[<ffffffffa2135298>] rds_page_remainder_alloc+0x48/0x2a0 [rds]
[<ffffffffa212f06d>] rds_message_copy_from_user+0x6d/0x130 [rds]
[<ffffffffa2133040>] rds_sendmsg+0x470/0x990 [rds]
[<ffffffff811ffa00>] ? rw_copy_check_uvector+0xa0/0x130
[<ffffffff815c9ffd>] sock_sendmsg+0x4d/0x60
[<ffffffff815cc93a>] ___sys_sendmsg+0x30a/0x330
[<ffffffff811b77fc>] ? handle_pte_fault+0x20c/0x230
[<ffffffff815ccb69>] __sys_sendmsg+0x49/0x90
[<ffffffff81023611>] ? syscall_trace_leave+0xf1/0x140
[<ffffffff815ccbc9>] SyS_sendmsg+0x19/0x20
[<ffffffff816c176e>] system_call_fastpath+0x12/0x71
------------------------------------------------------

[5] LOG 3:
------------------------------------------------------
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by
0, t=240007 jiffies, g=449043, c=449042, q=0)
All QSes seen, last rcu_sched kthread activity 240007
(4299336825-4299096818), jiffies_till_next_fqs=3, root ->qsmask 0x0
ora_lms0_orcltw R running task 0 22303 1
0x00000080
ffff8800c4651c00 00000000e7110062 ffff88010e803c18
ffffffff810b038f
ffff88010e8185c0 ffffffff81b22c40 ffff88010e803c98
ffffffff810e8f96
0000000000000000 ffffffff810b4deb ffff88010e817800
ffff88010e8185c0
Call Trace:
<IRQ> [<ffffffff810b038f>] sched_show_task+0xaf/0x120
[<ffffffff810e8f96>] rcu_check_callbacks+0x7e6/0x7f0
[<ffffffff810b4deb>] ? account_user_time+0x8b/0xa0
[<ffffffff810ee582>] update_process_times+0x42/0x70
[<ffffffff810fea65>] tick_sched_handle.isra.18+0x25/0x60
[<ffffffff810feae4>] tick_sched_timer+0x44/0x80
[<ffffffff810ef307>] __run_hrtimer+0x77/0x1d0
[<ffffffff810feaa0>] ? tick_sched_handle.isra.18+0x60/0x60
[<ffffffff810ef6e3>] hrtimer_interrupt+0x103/0x230
[<ffffffff8100a64d>] xen_timer_interrupt+0x3d/0x170
[<ffffffff814469a9>] ? add_interrupt_randomness+0x49/0x200
[<ffffffff810dd1ae>] handle_irq_event_percpu+0x3e/0x1a0
[<ffffffff810e0cfd>] handle_percpu_irq+0x3d/0x60
[<ffffffff810dc7ab>] generic_handle_irq+0x2b/0x40
[<ffffffff813fe91f>] evtchn_2l_handle_events+0x26f/0x280
[<ffffffff81085bba>] ? __do_softirq+0x18a/0x2d0
[<ffffffff813fbe8f>] __xen_evtchn_do_upcall+0x4f/0x90
[<ffffffff813fddf4>] xen_evtchn_do_upcall+0x34/0x50
[<ffffffff8170f35e>] xen_hvm_callback_vector+0x6e/0x80
<EOI>
rcu_sched kthread starved for 240007 jiffies!
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by
0, t=420012 jiffies, g=449043, c=449042, q=0)
All QSes seen, last rcu_sched kthread activity 420012
(4299516830-4299096818), jiffies_till_next_fqs=3, root ->qsmask 0x0
ora_lms0_orcltw R running task 0 22303 1
0x00000080
ffff8800c4651c00 00000000e7110062 ffff88010e803c18
ffffffff810b038f
ffff88010e8185c0 ffffffff81b22c40 ffff88010e803c98
ffffffff810e8f96
0000000000000000 ffff88010e817800 0000000000017800
ffff88010e8185c0
Call Trace:
<IRQ> [<ffffffff810b038f>] sched_show_task+0xaf/0x120
[<ffffffff810e8f96>] rcu_check_callbacks+0x7e6/0x7f0
[<ffffffff810ee582>] update_process_times+0x42/0x70
[<ffffffff810fea65>] tick_sched_handle.isra.18+0x25/0x60
[<ffffffff810feae4>] tick_sched_timer+0x44/0x80
[<ffffffff810ef307>] __run_hrtimer+0x77/0x1d0
[<ffffffff810feaa0>] ? tick_sched_handle.isra.18+0x60/0x60
[<ffffffff810ef6e3>] hrtimer_interrupt+0x103/0x230
[<ffffffff8100a64d>] xen_timer_interrupt+0x3d/0x170
[<ffffffff814469a9>] ? add_interrupt_randomness+0x49/0x200
[<ffffffff810dd1ae>] handle_irq_event_percpu+0x3e/0x1a0
[<ffffffff810e0cfd>] handle_percpu_irq+0x3d/0x60
[<ffffffff810dc7ab>] generic_handle_irq+0x2b/0x40
[<ffffffff813fe91f>] evtchn_2l_handle_events+0x26f/0x280
[<ffffffff813fbe8f>] __xen_evtchn_do_upcall+0x4f/0x90
[<ffffffff813fddf4>] xen_evtchn_do_upcall+0x34/0x50
[<ffffffff8170f35e>] xen_hvm_callback_vector+0x6e/0x80
<EOI> [<ffffffff81024847>] ?
do_audit_syscall_entry+0x67/0x70
[<ffffffff81025eb3>] syscall_trace_enter_phase1+0x143/0x1a0
[<ffffffff8112ac86>] ? __audit_syscall_exit+0x1e6/0x280
[<ffffffff81026216>] ? syscall_trace_leave+0xc6/0x120
[<ffffffff8170d69a>] tracesys+0xd/0x44
rcu_sched kthread starved for 420012 jiffies!
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by
0, t=600017 jiffies, g=449043, c=449042, q=0)
All QSes seen, last rcu_sched kthread activity 600017
(4299696835-4299096818), jiffies_till_next_fqs=3, root ->qsmask 0x0
ora_lms0_orcltw R running task 0 22303 1
0x00000080
ffff8800c4651c00 00000000e7110062 ffff88010e803c18
ffffffff810b038f
ffff88010e8185c0 ffffffff81b22c40 ffff88010e803c98
ffffffff810e8f96
0000000000000000 ffffffff810b4deb ffff88010e817800
ffff88010e8185c0
Call Trace:
<IRQ> [<ffffffff810b038f>] sched_show_task+0xaf/0x120
[<ffffffff810e8f96>] rcu_check_callbacks+0x7e6/0x7f0
[<ffffffff810b4deb>] ? account_user_time+0x8b/0xa0
[<ffffffff810ee582>] update_process_times+0x42/0x70
[<ffffffff810fea65>] tick_sched_handle.isra.18+0x25/0x60
[<ffffffff810feae4>] tick_sched_timer+0x44/0x80
[<ffffffff810ef307>] __run_hrtimer+0x77/0x1d0
[<ffffffff810feaa0>] ? tick_sched_handle.isra.18+0x60/0x60
[<ffffffff810ef6e3>] hrtimer_interrupt+0x103/0x230
[<ffffffff8100a64d>] xen_timer_interrupt+0x3d/0x170
[<ffffffff814469a9>] ? add_interrupt_randomness+0x49/0x200
[<ffffffff810dd1ae>] handle_irq_event_percpu+0x3e/0x1a0
[<ffffffff810e0cfd>] handle_percpu_irq+0x3d/0x60
[<ffffffff810dc7ab>] generic_handle_irq+0x2b/0x40
[<ffffffff813fe91f>] evtchn_2l_handle_events+0x26f/0x280
[<ffffffff813fbe8f>] __xen_evtchn_do_upcall+0x4f/0x90
[<ffffffff813fddf4>] xen_evtchn_do_upcall+0x34/0x50
[<ffffffff8170f35e>] xen_hvm_callback_vector+0x6e/0x80
<EOI>
rcu_sched kthread starved for 600017 jiffies!
------------------------------------------------------

[5] RCU config
-----------------------------------------------
# RCU Subsystem
CONFIG_TREE_RCU=y
CONFIG_SRCU=y
# CONFIG_TASKS_RCU is not set
CONFIG_RCU_STALL_COMMON=y
CONFIG_RCU_USER_QS=y
CONFIG_RCU_FANOUT=64
CONFIG_RCU_FANOUT_LEAF=16
# CONFIG_RCU_FANOUT_EXACT is not set
# CONFIG_RCU_FAST_NO_HZ is not set
# CONFIG_TREE_RCU_TRACE is not set
CONFIG_RCU_KTHREAD_PRIO=0
CONFIG_RCU_NOCB_CPU=y
# CONFIG_RCU_NOCB_CPU_NONE is not set
# CONFIG_RCU_NOCB_CPU_ZERO is not set
CONFIG_RCU_NOCB_CPU_ALL=y
# CONFIG_RCU_EXPEDITE_BOOT is not set
# RCU Debugging
# CONFIG_PROVE_RCU is not set
# CONFIG_SPARSE_RCU_POINTER is not set
# CONFIG_RCU_TORTURE_TEST is not set
CONFIG_RCU_CPU_STALL_TIMEOUT=60
# CONFIG_RCU_CPU_STALL_INFO is not set
# CONFIG_RCU_TRACE is not set
--------------------------------------------------

Next message: He Kuang: "[PATCH] perf script: Fix display inconsitency when call-graph config is used"
Previous message: Michael S. Tsirkin: "Re: [PATCH net-next] tuntap: introduce tx skb ring"
Next in thread: Paul E. McKenney: "Re: [rcu_sched stall] regression/miss-config ?"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]